<template>
  <div>
    <!-- 面包屑 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图 -->
    <el-card>
      <el-alert title="添加商品信息" type="info" center show-icon :closable="false"></el-alert>
      <!-- 步骤条区域 -->
      <el-steps :active="activeIndex - 0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
      <!-- form表单 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
        <!-- tab栏区域 -->
        <el-tabs v-model="activeIndex" :tab-position="'left'" 
        :before-leave="beforeTabLeave" @tab-click="tabClicked">
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
                <!-- 选择商品分类的级联选择框 -->
                <el-cascader
                    v-model="addForm.goods_cat"
                    :options="cateList"
                    :props="cateProps"
                    @change="handleChange">
                </el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <!-- 渲染表单的Item项 -->
            <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
              <!-- 复选框组 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox border :label="cb" v-for="(cb,i) in item.attr_vals" :key="i"></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!-- action表示上传到的后台api地址 也可以把地址放到data中-->
            <el-upload
              action="http://127.0.0.1:8888/api/private/v1/upload"
              :headers="headerObj"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              :on-success="handleSuccess"
              list-type="picture">
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <!-- 安装富文本编辑器vue-quill-editor插件 安装依赖，运行依赖安装-->
          <el-tab-pane label="商品内容" name="4">
            <!-- 富文本编辑器 -->
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <!-- 添加商品的按钮 -->
            <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>
    <!-- 图片预览 -->
    <el-dialog
      title="图片预览"
      :visible.sync="previewVisible"
      width="50%">
      <img :src="previewPath" alt="" width="100%">
    </el-dialog>
  </div>
</template>

<script>
// 安装依赖lodash，实现深拷贝
import _ from 'lodash'
import {cateList,getParams,addGoods} from '@/api'
export default {
    name:'Add',
    data() {
      return {
        activeIndex:'0',
        // 添加商品的表单数据对象
        addForm:{
          goods_name:'',
          goods_price:0,
          goods_weight:0,
          goods_number:0,
          // 商品所属的分类数组
          goods_cat:[],
          // 图片数组
          pics:[],
          // 商品介绍
          goods_introduce:'',
          attrs:[]
        },
        addFormRules:{
          goods_name: [
            { required: true, message: '请输入商品名称', trigger: 'blur' },
          ],
          goods_price:[
          { required: true, message: '请输入商品价格', trigger: 'blur' },
          ],
          goods_weight:[
          { required: true, message: '请输入商品重量', trigger: 'blur' },
          ],
          goods_number:[
          { required: true, message: '请输入商品数量', trigger: 'blur' },
          ],
          goods_cat:[
          { required: true, message: '请选择商品分类', trigger: 'blur' },
          ]
        },
        // 商品分类列表
        cateList:[],
        cateProps:{
          expandTrigger: 'hover',
          value:'cat_id',
          label:'cat_name',
          children:'children',
        },
        // 动态参数列表数据
        manyTableData:[],
        // 静态属性列表数据
        onlyTableData:[],
        // 图片上传组件的headers请求头对象
        headerObj:{
          Authorization:window.sessionStorage.getItem('token')
        },
        previewPath:'',
        previewVisible:false
      }
    },
    created(){
      this.getcateList()
    },
    methods: {
      // 获取所有商品分类数据
      getcateList(){
        cateList().then(({data:res})=>{
          if(res.meta.status !== 200){
            return this.$message.error('获取商品分类失败')
          }
          // console.log(res);
          this.cateList = res.data
        })
      },
      // 级联选择器选中项变化，会触发这个函数
      handleChange(){
        if(this.addForm.goods_cat.length !== 3){
          this.addForm.goods_cat = []
        }
      },
      // oldActiveName即将离开的标签页名称，即将进入的activeName
      beforeTabLeave(activeName,oldActiveName){
        if(oldActiveName === '0' && this.addForm.goods_cat.length !== 3){
          this.$message.error('请选择商品分类')
          return false
        }
      },
      tabClicked(){
        // 证明访问的是动态参数面板
        if(this.activeIndex === '1'){
          getParams(this.cateId,{params:{sel:'many'}}).then(({data:res})=>{
            // console.log(res);
            if(res.meta.status !== 200){
              return this.$message.error('获取动态参数列表失败')
            }
            res.data.forEach(item=>{
              item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
            })
            this.manyTableData = res.data
          })
        }else if(this.activeIndex === '2'){
          getParams(this.cateId,{params:{sel:'only'}}).then(({data:res})=>{
            console.log(res);
            if(res.meta.status !== 200){
              return this.$message.error('获取动态参数列表失败')
            }
            this.onlyTableData = res.data
          })
        }
      },
      // 处理图片预览效果
      handlePreview(file){
        // console.log(file);
        this.previewPath = file.response.data.url
        this.previewVisible = true
      },
      // 处理移出图片的操作
      handleRemove(file){
         // console.log(file)
        // 1. 获取将要删除的图片的临时路径
        const filePath = file.response.data.tmp_path
        // 2. 从 pics 数组中，找到这个图片对应的索引值
        const i = this.addForm.pics.findIndex(x => x.pic === filePath)
        // 3. 调用数组的 splice 方法，把图片信息对象，从 pics 数组中移除
        this.addForm.pics.splice(i, 1)
        console.log(this.addForm)
      },
      // 监听图片上传成功的事件
      handleSuccess(response){
        //1.拼接得到一个图片信息对象
        const picInfo = {pic:response.data.tmp_path}
        //2.将图片信息对象，push到pics数组中
        this.addForm.pics.push(picInfo)
        // console.log(this.addForm);
      },
      // 添加商品
      add(){
        this.$refs.addFormRef.validate(valid=>{
          if(!valid) {
            return thie.$message.error('请填写必要的表单项！')
          }
          // 执行添加的业务逻辑
           // 处理动态参数
           this.manyTableData.forEach(item => {
            const newInfo = {attr_id:item.attr_id,attr_value:item.attr_vals.join(' ')}
            this.addForm.attrs.push(newInfo)
          })
          // 处理静态属性
          this.onlyTableData.forEach(item => {
            const newInfo = {attr_id:item.attr_id,attr_value:item.attr_vals}
            this.addForm.attrs.push(newInfo)
          })
          // 深拷贝this.addForm,为一个新的form，不影响之前的
          const form = _.cloneDeep(this.addForm)
          form.goods_cat = form.goods_cat.join(',')
         
          // 把attrs给新的form
          // form.attrs = this.addForm.attrs
          console.log(form);
          // 发起请求添加商品
          // 商品名称，必需是唯一的
          addGoods(form).then(({data:res})=>{
            if(res.meta.status == 201){
              this.$message({message: '添加商品成功!',type: 'success'})
              this.$router.push('/goods')
            }else{this.$message.error('添加商品失败!')}
          })
        })
      }
    },
    computed:{
      cateId(){
        return this.addForm.goods_cat[2]
      }
    }
}
</script>

<style lang="less" scoped>
  .el-checkbox{
    margin: 0;
  }
  .btnAdd{
    margin-top: 15px;
  }
</style>